Holder for plates in the manufacture of photo-engravings



(No llodel.) 2 Sheetsv-Sheet 1.

M. LEVY.

' HOLDER FOR PLATES IN-ITHEKMANUIAGTURE 0F PHOTO-ENGRAVINGS. No.504,597. Patented Sept. 5, 1893.

(No Model.) 2 Sheets-Sheet 2. M. LEVY. HOLDER FOR PLATES IN THEMANUFACTURE OF PHOTGENGRAVINGS.

No. 504,597. Patented Sept. 5, 1893.

llllll Unrrnn STATES PATENT OFFICE.

MAX LEVY, OF PHILADELPHIA, PENNSYLVANIA.

HOLDER FOR PLATES IN THE MANUFACTURE OF PHOTO-ENGRAVINGS.

SPECIFICATION forming part of Letters Patent No. 504,597, datedSeptember 5, 1893.

Application filed May 4, 1893. SerialNo. 472,997. (No model.)

T0 51. whom it may concern.

Be it known that I, MAX LEVY, a citizen of the United States of America,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inHolders for Plates in the Manufacture of Photo-Engravings; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

This invention relates to improvements in holders for plates which areto be etched in the manufacture of half-tones or art of producingphoto-engravings.

The object of the invention is to provide a holder for the plate bymeans of which the coating can be placed on the plate equally.

In the accompanying drawings: Figure 1 is a plan view. Fig. 2 is a sideview of an apparatus for holding plates to be coated. Fig. 3 is asectional view, taken on the line :cm of Fig. 2 and Figs. at and 5 aredetail views.

A designates a bracket, which is secured to a suitable support and isprovided with vertical hearings to which a swinging arm 13 is attached.To the outer end of the arm is formed or secured a face-plate b againstwhich bears a face-plate formed on a support 0; said support beingpivoted to the arm by a bolt 0 which extends through the face-plate band within the arm, where it is encircled by a helical spring 0' whichbears against the arm and a head formed on the bolt so as to retain thesupport 0 in position against the end of said arm. Through the support 0passes a shaft 0 which carries at one end a handle (Z for turning thesame and at the other end a table or support D. The table consists offour arms which radiate from the center and are slotted to receiveclamps D, provided for holding the plate upon the arms or table. Theseclamps are made up of a plate cl and a depending plate (1 which projectsthrough the slot in the arm and carries at its lower end a cam adaptedto be operated to draw the plate d toward the upper surface of the arm,

the rear end of said plate having depending lugs (Z which bear upon thearm and cause the front end to be tilted when the cam is operated.

Upon the arm B is pivoted a spring catch or lever B, the end of whichengages with a notch in the edge of the face-plate b and with thenotches c in the edge of the face-plate of the support 0, the notches 0being positioned diametrically opposite each other so that the table canbe supported in a horizontal position with the face of the plate up orin a horizontal position with the face of the plate down. In the latterposition the plate is brought over the heating medium which is employedto dry the coating. It will be understood that the end of the lever Bexactly fits the notches in the face-plates, so that the table will besupportedin a perfectly horizontal position either up or down.

\Vhen it is desired to rotate the support or table D by mechanical meansinstead of manually I provide the support 0 with a doublefaced gearwheelE, which is free to rotate, and the end of the shaft 0 farthest from thetable is provided with a pinion e which meshes with said gearwheel. Thegearwheel E is driven by a pinion e mounted on a pin projecting from'thebracket-arm, and upon said pin to one side of the pinion is a drumfhaving a pawl which engages with ratchet-teeth on the side of thepinion 6'. Upon the drum is wound a suitable flexible connection or cordg, which is guided over pulleys and has attached thereto a weight IV,and wound upon the drum in an opposite direction from the cord g is acord g, which is also guided over a pulley and carries a weight IV, thelatter weight merely being of sufficient size to rotate the drum to windthe cord g thereon when the weight W is lifted. It will be noted thatwhen the weight W descends it rotates the drum so that the pawl willengage the ratchet-teeth and revolve the pinion, the same movement ofthe drum winding up the cord g to elevate the smaller weight 7'. Thetable may have a suitable plane surface or track H on its under side,and the support 0 may be provided with a disk, as It, so that byproperly adjusting this disk against the plane sur=- face of the tablethe rotation of said table can be regulated to suit the requirements andthe density of the solution with which the a plate is to be coated.

Having thus described my invention, I claim- 1. In a plate holder, thecombination, of a horizontally movable bracket arm, a reversible supportcarried thereby and a table mounted on the support said table havingclamps for attaching a plate thereto, together with means for rotatingthe table, for the purpose set forth.

2. In a plate holder for the purpose set forth, the combination of aswinging arm suitably secured to a support, said arm carrying arotatable table support, the table which is mounted thereon havingslots, and clamps D carried by the table, substantially as shown, andfor the purpose set forth.

3. In combination with a swinging bracket,

of a rotatable table support having notches, or projections, oppositeeach other, of a catch carried by the bracket which is adapted to engagewith said notches to hold the table in a horizontal position above orbelow the bracket, substantially as shown.

4:. In combination with a bracket and table support having suitablegearing, of a drum containing a spring, a cord which is adapted to bewound upon the drum by the action of said spring, suitable clutchmechanism between the drum and gearing, and a weight attached to thecord, substantially as shown, and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

MAX LEVY.

Witnesses:

JOHN F. TURNER, H. C. WHIPPLE.

